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Sprayable agricultural compositions and method

a technology of agricultural compositions and sprayable water, applied in the direction of biocide, plantation, treatment using complex/solubilising chemicals, etc., can solve the problems of not being able to apply through drip or sprinkler irrigation systems, and not being able to apply together with calcium polysulfide, methyldithiocarbamate, etc., to precipita

Inactive Publication Date: 2010-02-23
BAKER GEORGE B
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]It is an object of the present invention to provide a process which enables calcium polysulfide to be applied to fields through a sprinkler or drip irrigation system.
[0009]The invention includes a method of reducing or preventing precipitation of calcium polysulfide added to the water in an irrigation system by first injecting the precipitation preventing compound into the water in an amount effective to reduce or eliminate precipitation of the calcium polysulfide at low concentrations.

Problems solved by technology

However, it cannot be applied through drip or sprinkler irrigation systems because the calcium precipitates and plugs the system.
However, it cannot be applied together with calcium polysulfide because it would cause the sodium methyldithiocarbamate to precipitate.

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0010]Calcium polysulfide, sometimes called “lime sulfur”, has the formula CaSx. It is sold as an aqueous solution containing about 29% by weight calcium polysulfide. The solution contains about 2.2 pounds sulfur per gallon and about 0.6 pounds calcium per gallon. If injected into the water stream of a sprinkler or drip irrigation system, the calcium precipitates out and eventually plugs the relatively small orifices found in sprinkler heads, center pivots, etc. Calcium precipitation has been found to occur at or below about 1% by weight of calcium polysulfide in water.

[0011]It has been discovered that if an aqueous solution containing a precipitation preventing compound selected from the group consisting of sodium hydrosulfide and sodium sulfide is present, precipitation can be avoided at calcium polysulfide concentrations in water below about 1%.

[0012]Sodium hydrosulfide (sometimes called sodium sulphydrate or “NASH”) has the formula NaSH.2H2O or NaSHe.3H2O.

[0013]Potassium hydrosu...

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Abstract

A composition including an aqueous solution of calcium polysulfide and an amount of a precipitation preventing compound effective to reduce or eliminate precipitation of the calcium polysulfide at low concentrations. The precipitation preventing compound is selected from the group consisting of sodium hydrosulfide, potassium hydrosulfide, sodium sulfide, and potassium sulfide. A method of reducing or preventing precipitation of calcium polysulfide added to the water in an irrigation system by first injecting the precipitation preventing compound into the water in an amount effective to reduce or eliminate precipitation of the calcium polysulfide at low concentrations. Sodium methyldithiocarbamate can be added to the calcium polysulfide / precipitation preventing compound solution without any substantial precipitation.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of U.S. Provisional Application No. 60 / 771,290, filed Feb. 7, 2006.BACKGROUND OF THE INVENTION[0002]This invention relates to sprayable agricultural compositions, and to a method of reducing or preventing precipitation of calcium polysulfide from an aqueous solution in which it is present in a low concentration.[0003]It is known to apply calcium polysulfide solutions to soil used for agricultural purposes. Calcium polysulfide supplies calcium and colloidal sulfur to the soil, both being crucial plant growing nutrients. In alkaline soil it lowers the pH. It acts as a fungicide, insecticide and a miticide for fruits, nuts, ornamentals, roses, etc.[0004]Calcium polysulfide is applied by adding it to irrigation water or shank injection. However, it cannot be applied through drip or sprinkler irrigation systems because the calcium precipitates and plugs the system.[0005]Sodium methyldithiocarbamate is a comm...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C02F5/08
CPCC02F5/083Y10S111/90
Inventor BAKER, GEORGE B.
Owner BAKER GEORGE B
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